Micrometer gauge



`2?. 1927. Feb R. DAIKER MICROMETER GAUGE Filed Sent. 12, 1922 Patented Fen. 22, 1927.

UNITED STATES PATENT OFFICE.

mcna'nn nAIKEia-or FELLBAcn, WURTT'EMBRG, GERMANY.

'MrcnoME-Tnn GAUGE.

Application led September 12, i922, Serial No'. 587,781', aixd in 'GcrmanyA September 12,*1921.

The transmission of the movement of the'- feeler in measuring implements to the device which actuatcs an indicator, is attended with diliculties, more particularly when the two devices are movable longitudinally and are situated at an angle relative to one another.

The ,present invention relates to an arrangement in wh'ichthe 'movement of the'v feeler in such cases is transmitted in a 'simple andaccurate manner, whereby a very accurate measurement is obtained. The4 invention is moreover distinguished by its sirnplicity which, in turn is a factor in the ac-V curacy of the measuring.

The invention consists in the4 employment as a transmission device, of a body in the form of an arc of a circle, loosely movable -in a correspondingly shaped guide, which is pushed bythe touch bolt or feeler and in turn moves thev indicator actuating device to precisely the same degree. The movable transmission device is so arranged that'l there is no play vand such that vit cannot occur in the course of time. One end'of the device bearsv against the face of the feeler and the other end bears against the end of the indicatoractuating'device or an extension thereof.

Provision 1s also made so that, 1n the case of cylindrical hollow bodies, it is assured that measurement must be made on the largest diameter. l l

Gne form of the invention is illustrated by way of example' in the accompanying drawings, wherein:

Fig. 1 is an axial section of the device, Fig. 2 is a front elevation, and -Figure 3 is a plan view with parts broken away. vIn eneral, 'the feeler a is arranged to move ongitudinally and is situated -at an angle, in the present example of construction at a rightangle, to the indicator actuating device b, which is likewise movable longitudinally -in order that its movement 'actuate an indicator (not shown) of any conventional design. A transmission device, d, in the formof an arc of a circle, is 'arranged to slide loosely in a correspondingly shaped guide z'. One end of device d bears line wit against the facel of the feeler a and the other a'gude' z', of are shape.

As shown in Figs. 1- 3, the feeler a is guided in a. bush e and a nut f that is Screwed into the latter. It is acted on by a spring g tending to press it inwards.' It bears against the transmission device d, which, as stated, is' 4constructed as a vsliding piece, in the form of an arc of a circle, and guided in the head of the instrument by Device d bears against the end of a rod k connected to the indicator actuating device b, which is under thejaction of a spring l which is stronger than the spring g' and therefore operates to press the feeler a outwards. The member -btogether with the rod -cand the intervening connecting piece, together are all in axial alinement and together'form 'an indicator actuating means.

On the other end of the head h,- a fixed inpiace by a cap lnut Regarding the showing of the guide mem- I ber z' in Fig. 1 the part p is split (or cleft) and the two partslie flat against'each other. The upper ends of the parts p are semicircular in cross section and are screw threaded to receive the casingk. The lower' ends of the parts p are flattened as at and when placed togetherl form a rectangular shaped vguide having a width equal to that of a guide slot s in the.' member 0. for

slidingly guiding themeinber o, (see Figs. l' and 3). The guide for the part ai 1s curved along the arc of a circle and 1s cut .one-half out of each of the inner surfaces of 4the lower portions glof the two parts p. The parts p, g are not atched on the drawing since' thecutting plane passes through the split portions.

In `order finally, that it may be possible "fin measuring the clearwidth of hollow cyl-- inders and the like, to always measure with certainty on the. largest diameter, a stop o is arranged on the head h, so as to be movrooy able longitudinally thereof. This stop is under the action of a spring t whlch presses i it outward, in connection wherewith the movement is limited by the nut f. The

stop o is prevented from turning by the pieces p that are held in head h, by pin r 'and are provided with parallel surfaces. The part g is inserted in a corresponding opening in the head. h and there secured by vthetransverse pini r., The Stop o is guided on 'the part q by means' of the slot s therein and therebyA prevented from indicator Aactuating means, an arcfshaped devvice forv directly transmitting motion from the feeler toqthe indicator actuating' n1eans' andv an arc-shaped guide for loosely guiding the arc-shaped device.

' 2. In a micrometer gauge, f a movable feeler, indicator actuating means, al1 arcshaped vdevice for du'ectly transmttlng motion from the feeler to thc indicator actuating means, and an arc-Shaped guide for looselyV guiding the arc-shaped device, the motion of the feeler being at an angle to that of the indcatoractuating device.

` 3. In a micrometer gauge, a movable eeler, indicator actuating means, an arcshaped device for directly transmitting ino-f. tion from the feeler to the indicator actat' ing means, an arc-shaped guide for loosely guidingo the arc-shaped device, and a double ended stop positioned on the feeler, the stop having its ends rounded and lying in the circumference of a circle having its center in the axis of the feeler. y

In testimony whereof I have signed my .namey to this specication.

" RICHARD DA'IKER. 

